Battery cover plate, battery monomer and vehicle

Abstract

The utility model relates to the technical field of battery explosion prevention, and discloses a battery cover plate, a battery monomer and a vehicle, the battery cover plate comprises a cover plate assembly, an explosion-proof valve and a protection sheet, the cover plate assembly covers a pole core cavity of the battery monomer, and a mounting hole is formed in the cover plate assembly; the edge of the anti-explosion valve is connected with the edge of the mounting hole in a sealing manner; the protection sheet is arranged on the cover plate assembly, at least shields part of the surface, facing the pole core cavity, of the anti-explosion valve, and the protection sheet is suitable for being melted under the condition that the preset temperature is reached; the problem that the battery cover plate is easily damaged by foreign objects in the production, carrying and transportation processes can be solved or improved.

Description

Technical Field

[0001] The present application relates to the technical field of battery explosion-proofing, and in particular to a battery cover, a battery cell and a vehicle. Background Art

[0002] The battery explosion-proof valve is an important component of the battery safety protection system. During the charging and discharging process, especially in abnormal conditions such as overcharging, over-discharging or short circuit, gas will be generated inside the battery, causing the pressure to increase rapidly. When the internal pressure of the battery exceeds the set safety range, the explosion-proof valve will activate to release the gas inside the battery. As the gas is released, the internal pressure of the battery gradually decreases.

[0003] In the related art, the explosion-proof valve is set on the battery cover. During the production, handling and transportation of the battery cover, the part of the explosion-proof valve facing the interior of the battery is exposed. There is a risk of foreign objects coming into contact with the exposed part of the explosion-proof valve, resulting in the risk of damage to the explosion-proof valve, which in turn affects the performance requirements of the explosion-proof valve. Utility Model Content

[0004] In view of this, the present application provides a battery cover, a battery cell and a vehicle to solve or improve the problem that the battery cover is easily damaged by foreign objects during production, handling and transportation.

[0005] In the first aspect, the present application provides a battery cover, comprising a cover assembly, an explosion-proof valve and a protective sheet, wherein the cover assembly is arranged to cover the pole core cavity of the battery cell, and a mounting hole is provided on the cover assembly; the edge of the explosion-proof valve is sealed with the edge of the mounting hole; the protective sheet is arranged on the cover assembly, and the protective sheet at least blocks a portion of the surface of the explosion-proof valve facing the pole core cavity, and the protective sheet is suitable for melting when a preset temperature is reached.

[0006] By providing a protective sheet on the cover assembly to block at least a portion of the surface of the explosion-proof valve facing the pole core cavity, the explosion-proof valve can be shielded and protected, which can reduce the chance of foreign objects coming into contact with the explosion-proof valve during the production, transportation and handling of the battery cover, thereby reducing the chance of the explosion-proof valve being damaged by foreign objects and avoiding affecting the performance of the explosion-proof valve; and the protective sheet can melt at a preset temperature, so that when high temperature and high pressure occur inside the battery, it will be melted and will not block the discharge of gas inside the battery.

[0007] In an optional embodiment, the cover plate assembly includes a top cover and an insulating seat, the top cover is suitable for sealing the pole core cavity; the insulating seat is connected to the side of the top cover facing the pole core cavity, the mounting hole is arranged on the top cover, and the insulating seat is provided with a through hole corresponding to the explosion-proof valve, and the protective sheet at least covers a part of the opening corresponding to the explosion-proof valve on the through hole.

[0008] In an optional embodiment, a receiving groove is provided on the surface of the insulating seat close to the top cover assembly, the explosion-proof valve is provided in the receiving groove, and the through hole is provided on the bottom surface of the receiving groove.

[0009] In an optional embodiment, the protection sheet at least covers a central portion of the through hole.

[0010] In an optional embodiment, the protective sheet is fixed on the inner bottom surface of the accommodating groove; or, the protective sheet is fixed on the outer bottom surface of the accommodating groove.

[0011] In an optional embodiment, the length of the protective sheet along the length direction of the through hole is 40% to 100% of the length of the through hole; and / or the length of the protective sheet along the width direction of the through hole is not less than the width of the through hole.

[0012] In an optional embodiment, the protection sheet is adhered to the insulating seat.

[0013] In an optional embodiment, the protective sheet is provided with ventilation holes; and / or the protective sheet is a plastic film sheet.

[0014] In a second aspect, the present application further provides a battery cell comprising a pole core cavity and a battery cover according to any one of the embodiments of the first aspect, wherein the cover assembly encloses the pole core cavity.

[0015] Beneficial effects: Since the battery cell includes a battery cover plate, it has the same effects as the battery cover plate, which will not be described in detail here.

[0016] In a third aspect, the present application also provides a vehicle comprising the battery cell in the second aspect.

[0017] Beneficial effects: Since the vehicle includes a battery cell, it has the same effects as the battery cell, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of this application or the technical solutions in related technologies, the following will briefly introduce the drawings required for use in the specific implementation methods or related technical descriptions. Obviously, the drawings described below are some implementation methods of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is an exploded view of a battery cover in the related art;

[0020] Figure 2 An exploded view of a battery cover according to an embodiment of the present application;

[0021] Figure 3 for Figure 2 Bottom view of the middle battery cover;

[0022] Figure 4 An exploded view of another battery cover according to an embodiment of the present application;

[0023] Figure 5 for Figure 4 Bottom view of the middle battery cover.

[0024] Description of reference numerals:

[0025] 1. Cover plate assembly; 2. Explosion-proof valve; 3. Protective sheet; 4. Protective sheet;

[0026] 101. Mounting hole; 102. Top cover; 103. Insulation seat;

[0027] 1031, receiving groove; 1032, through hole;

[0028] 301. Ventilation hole. DETAILED DESCRIPTION

[0029] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0030] In related technologies, the battery explosion-proof valve 2 is an important component of the battery safety protection system. During the charging and discharging process of the battery, especially in abnormal conditions such as overcharging, over-discharging or short circuit, gas will be generated inside the battery, causing the pressure to increase rapidly; when the internal pressure of the battery exceeds the set safety range, the explosion-proof valve 2 will be activated to release the gas inside the battery; as the gas is released, the internal pressure of the battery gradually decreases.

[0031] However, the explosion-proof valve 2 is provided on the battery cover, as shown in FIG. Figure 1 As shown, during the production, handling and transportation of the battery cover, the portion of the explosion-proof valve 2 facing the interior of the battery is exposed. There is a risk that foreign objects may come into contact with the exposed portion of the explosion-proof valve 2, causing damage to the explosion-proof valve 2, thereby affecting the performance requirements of the explosion-proof valve 2.

[0032] In order to solve the above technical problems, the present application provides a battery cover, a battery cell and a vehicle, which can solve or improve the problem that the battery cover is easily damaged by foreign objects during production, handling and transportation.

[0033] The following combination Figures 2 to 5 , describing the embodiments of the present application.

[0034] According to an embodiment of the present application, in a first aspect, a battery cover is provided, such as Figure 2 or Figure 4 As shown, it includes a cover assembly 1, an explosion-proof valve 2 and a protective sheet 3. The cover assembly 1 is arranged to cover the pole core cavity of the battery cell, that is, it is suitable for covering the opening of the pole core cavity of the battery cell, and a mounting hole 101 is provided on the cover assembly 1; the edge of the explosion-proof valve 2 and the edge of the mounting hole 101 are sealed and connected by laser welding; the protective sheet 3 is arranged on the cover assembly 1, and the protective sheet 3 at least blocks a part of the surface of the explosion-proof valve 2 facing the pole core cavity, and the protective sheet 3 is suitable for melting when a preset temperature is reached.

[0035] Specifically, the explosion-proof valve 2 can be any type of explosion-proof valve; the shape of the mounting hole 101 can be any shape, such as an ellipse, a rectangle with rounded corners, etc.; the protective sheet 3 is specifically a PET film sheet.

[0036] It should be noted that the protective sheet 3 at least blocks a portion of the surface of the explosion-proof valve 2 facing the pole core cavity, which means that a portion or all of the surface of the explosion-proof valve 2 close to the pole core cavity is blocked by the protective sheet 3 .

[0037] It should be explained that the protective sheet 3 is suitable for melting when a preset temperature is reached. The preset temperature can be set according to the critical temperature, and can be lower than the critical temperature or equal to the critical temperature, and is set according to actual needs. The critical temperature is the internal temperature of the battery corresponding to when the internal pressure of the battery exceeds the safety range (i.e., the set pressure relief pressure value of the explosion-proof valve 2); the protective sheet 3 can be a sheet of any material that can melt at a preset temperature, such as a plastic film sheet.

[0038] It is worth noting that the protective sheet 3 is fixedly connected to the cover assembly 1. The protective sheet 3 can be fixedly connected to the cover assembly 1 along a portion of its edge, or along the entire edge. Of course, it can also be any other connection method, as long as the protective sheet 3 can at least block a portion of the surface of the explosion-proof valve 2 facing the pole core cavity.

[0039] In this embodiment, Figures 2 to 5 As shown, a protective sheet 3 is provided on the cover assembly 1 to block at least a portion of the surface of the explosion-proof valve 2 facing the pole core cavity, thereby shielding and protecting the explosion-proof valve 2, and reducing the probability of foreign objects coming into contact with the explosion-proof valve 2 during the production, transportation and handling of the battery cover, thereby reducing the probability of the explosion-proof valve 2 being damaged by foreign objects and avoiding affecting the performance of the explosion-proof valve 2; and the protective sheet 3 can melt at a preset temperature, so that when high temperature and high pressure occur inside the battery, it will be melted and will not block the discharge of gas inside the battery.

[0040] In one embodiment, Figure 2 and Figure 3 As shown, the cover plate assembly 1 includes a top cover 102 and an insulating seat 103. The top cover 102 is suitable for sealing the pole core cavity; the insulating seat 103 is connected to the side of the top cover 102 facing the pole core cavity, the mounting hole 101 is provided on the top cover 102, and the insulating seat 103 is provided with a through hole 1032 corresponding to the explosion-proof valve 2, and the protective sheet 3 covers at least a part of the opening corresponding to the explosion-proof valve 2 on the through hole 1032.

[0041] Specifically, the insulating seat 103 is a plastic seat, and the top cover 102 is an aluminum cover.

[0042] In this embodiment, the cover plate assembly 1 includes a fixedly connected top cover 102 and an insulating seat 103, which is a structure commonly used in existing battery cells. The explosion-proof valve 2 is sealed and connected to the mounting hole 101 on the top cover 102, and is connected to the pole core cavity through the through hole 1032. Therefore, the protective sheet 3 covers at least a portion of the opening corresponding to the explosion-proof valve 2 on the through hole 1032, thereby blocking at least a portion of the surface of the explosion-proof valve 2 facing the pole core cavity, thereby reducing the chance of damage to the explosion-proof valve 2 by foreign objects.

[0043] In one embodiment, Figure 2 or Figure 4 As shown, a receiving groove 1031 is provided on the surface of the insulating seat 103 close to the top cover 102 assembly, the explosion-proof valve 2 is provided in the receiving groove 1031, and the through hole 1032 is provided on the bottom surface of the groove 1031. By accommodating the explosion-proof valve 2 through the receiving groove 1031, the size of the through hole 1032 can be reduced to meet the design requirements.

[0044] In a specific embodiment, the protective sheet 3 covers at least the center of the through hole 1032, that is, the center of the through hole 1032 is definitely covered with the protective sheet 3. In this embodiment, foreign objects can easily contact the explosion-proof valve 2 from the center of the through hole 1032, causing damage to the explosion-proof valve 2. The protective sheet 3 covers at least the center of the through hole 1032, thereby increasing the probability of the explosion-proof valve 2 being damaged by foreign objects and providing better protection and isolation for the explosion-proof valve 2.

[0045] In one embodiment, Figure 2 and Figure 3 As shown, the protective sheet 3 is fixed on the inner bottom surface of the receiving groove 1031; or, as shown Figure 4 and Figure 5 As shown, the protection sheet 3 is fixed on the outer bottom surface of the accommodating groove 1031 .

[0046] It should be noted that the inner bottom surface of the accommodating groove 1031 refers to the outer surface of the accommodating groove 1031 facing the pole core cavity; the outer bottom surface of the accommodating groove 1031 refers to the outer surface of the accommodating groove 1031 facing the pole core cavity.

[0047] In this embodiment, the protection sheet 3 is fixed to the inner bottom surface or the outer bottom surface of the receiving groove 1031 by gluing or welding, which has a simple structure and is easy to operate.

[0048] In one embodiment, the length A of the protective sheet 3 along the length direction of the through hole 1032 is 40% to 100% of the length B of the through hole 1032; preferably, it is any one of 40%, 50%, 60%, 65%, 70%, 80%, 90% and 100%, and more preferably 65%; of course, the length A of the protective sheet 3 along the length direction of the through hole 1032 can be greater than the length B of the through hole 1032, which is to facilitate the fixation of the protective sheet 3; and / or, the length D of the protective sheet 3 along the width direction of the through hole 1032 is not less than the width C of the through hole 1032, which can facilitate the fixed connection between the protective sheet 3 and the insulating seat 103.

[0049] In one embodiment, Figure 2 or Figure 4 As shown, the protective sheet 3 is provided with an air hole 301; specifically, the number of the air hole 301 can be one or more, which can be set according to actual conditions. The position of the air hole 301 can be anywhere on the protective sheet 3, as long as it can facilitate the discharge of the high-pressure gas inside the battery. Preferably, the air hole 301 is provided in the center of the protective sheet 3.

[0050] In this embodiment, by providing the vent hole 301, the high-temperature and high-pressure gas inside the battery can be easily discharged, preventing the high-temperature and high-pressure gas inside the battery from being blocked before the protective sheet 3 melts and affecting the performance indicators of the explosion-proof valve 2, thereby further improving the safety performance of the battery cell.

[0051] In some embodiments not shown, Figure 2 As shown, a protective sheet 4 is provided on the surface of the explosion-proof valve 2 away from the pole core cavity. The protective sheet 4 is made of a PET film sheet and can protect the explosion-proof valve 2.

[0052] The following embodiment fully illustrates the technical solution of this application;

[0053] This embodiment provides a battery cover, such as Figures 2 to 5As shown, it includes a cover assembly 1, an explosion-proof valve 2 and a protective sheet 3. The cover assembly 1 is used to close the pole core cavity of the battery cell. The cover assembly 1 is provided with a mounting hole 101. The edge of the explosion-proof valve 2 and the edge of the mounting hole 101 are sealed by laser welding. The protective sheet 3 is provided on the cover assembly 1. The protective sheet 3 at least blocks a portion of the surface of the explosion-proof valve 2 facing the pole core cavity. The protective sheet 3 is suitable for melting under the condition of reaching a preset temperature. Figure 2 or Figure 4 As shown, the protective sheet 3 is provided with a vent hole 301. Specifically, the number of the vent hole 301 can be one or more, and can be set according to actual conditions. The position of the vent hole 301 can be anywhere on the protective sheet 3, as long as it can facilitate the discharge of the high-pressure gas inside the battery. Preferably, the vent hole 301 is provided in the center of the protective sheet 3.

[0054] Specifically, the cover plate assembly 1 includes a top cover 102 and an insulating seat 103. The top cover 102 is suitable for blocking the pole core cavity; the insulating seat 103 is connected to the side of the top cover 102 facing the pole core cavity, the mounting hole 101 is provided on the top cover 102, and the insulating seat 103 is provided with a through hole 1032 corresponding to the explosion-proof valve 2. The protective sheet 3 covers at least a portion of the opening of the through hole 1032 corresponding to the explosion-proof valve 2; Figure 2 or Figure 4 As shown, a receiving groove 1031 is provided on the surface of the insulating seat 103 close to the top cover 102 assembly, the explosion-proof valve 2 is provided in the receiving groove 1031, the through hole 1032 is provided on the bottom surface of the receiving groove 1031, and the protective sheet 3 covers at least the center portion of the through hole 1032; Figure 2 and Figure 3 As shown, the protective sheet 3 is fixed on the inner bottom surface of the receiving groove 1031; or, as shown Figure 4 and Figure 5 As shown, the protection sheet 3 is fixed on the outer bottom surface of the accommodating groove 1031 .

[0055] More specifically, the length A of the protective sheet 3 along the length direction of the through hole 1032 is 40% to 100% of the length B of the through hole 1032; preferably, it is any one of 40%, 50%, 60%, 65%, 70%, 80%, 90% and 100%, and more preferably, it is 65%; of course, the length A of the protective sheet 3 along the length direction of the through hole 1032 can be greater than the length B of the through hole 1032, which is to facilitate the fixation of the protective sheet 3; and / or, the length D of the protective sheet 3 along the width direction of the through hole 1032 is not less than the width C of the through hole 1032, which can facilitate the fixed connection between the protective sheet 3 and the insulating seat 103.

[0056] According to an embodiment of the present application, in a second aspect, a battery cell is provided, comprising a pole core cavity and a battery cover according to any one embodiment of the first aspect, wherein the cover assembly 1 encloses the pole core cavity.

[0057] Specifically, the battery cell can be any battery that requires the arrangement of the explosion-proof valve 2, such as a lithium battery.

[0058] In this embodiment, since the battery cell includes a battery cover plate, it has the same effect as the battery cover plate and is not described in detail here.

[0059] According to an embodiment of the present application, in a third aspect, a vehicle is provided, comprising the battery cell according to the second aspect.

[0060] Specifically, the vehicles that need to install batteries include SUVs, sedans, etc., not just new energy vehicles.

[0061] In this example, since the vehicle includes a battery cell, it has the same effects as the battery cell and will not be described in detail here.

[0062] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims.

Claims

1. A battery cover, characterized in that: include: A cover plate assembly (1) is provided to cover the pole core cavity of the battery cell, and a mounting hole (101) is provided on the cover plate assembly (1); An explosion-proof valve (2), wherein the edge of the explosion-proof valve (2) is sealedly connected to the edge of the mounting hole (101); as well as A protective sheet (3) is provided on the cover plate assembly (1), the protective sheet (3) at least shielding a portion of the surface of the explosion-proof valve (2) facing the pole core cavity, and the protective sheet (3) is suitable for melting under the condition of reaching a preset temperature.

2. The battery cover according to claim 1, characterized in that: The cover plate assembly (1) comprises: A top cover (102) adapted to seal the pole core cavity; An insulating seat (103), the insulating seat (103) is connected to a side of the top cover (102) facing the pole core cavity, the mounting hole (101) is provided on the top cover (102), a through hole (1032) corresponding to the explosion-proof valve (2) is provided on the insulating seat (103), and the protective sheet (3) covers at least a portion of the opening of the through hole (1032) corresponding to the explosion-proof valve (2).

3. The battery cover according to claim 2, characterized in that: A receiving groove (1031) is provided on the surface of the insulating seat (103) close to the top cover (102) assembly, the explosion-proof valve (2) is provided in the receiving groove (1031), and the through hole (1032) is provided on the bottom surface of the receiving groove (1031).

4. The battery cover according to claim 2 or 3, characterized in that: The protective sheet (3) at least covers the central portion of the through hole (1032).

5. The battery cover according to claim 3, characterized in that: The protective sheet (3) is fixed on the inner bottom surface of the accommodating groove (1031); Alternatively, the protective sheet (3) is fixed on the outer bottom surface of the accommodating groove (1031).

6. The battery cover according to claim 2 or 3, characterized in that: The length of the protective sheet (3) along the length direction of the through hole (1032) is 40% to 100% of the length of the through hole (1032); And / or, the length of the protective sheet (3) along the width direction of the through hole (1032) is not less than the width of the through hole (1032).

7. The battery cover according to claim 2 or 3, characterized in that: The protective sheet (3) is bonded to the insulating seat (103).

8. The battery cover according to any one of claims 1 to 3, characterized in that: The protective sheet (3) is provided with ventilation holes (301); And / or, the protective sheet (3) is a plastic film sheet.

9. A battery cell, characterized in that: include: Core cavity; as well as The battery cover according to any one of claims 1 to 8, wherein the cover assembly (1) encloses the pole core cavity.

10. A vehicle, characterized in that: Comprising the battery cell according to claim 9.

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